railpack

1// Unlike the mise step builder, this builder uses mise to install a binary, but throws away all of the mise installation cruft2// this reduces the image size considerably. Image sizes are important: performance is a feature and smaller images perform better.3// They are easier to move around, debug, use less storage, etc. This is why we have this step in use on particular high-volume build paths.4 5// TODO this builder is not exposed to the user right now via railpack.json6 7package generate8 9import (10	"fmt"11 12	"github.com/railwayapp/railpack/core/plan"13	"github.com/railwayapp/railpack/core/resolver"14)15 16const (17	BinDir = "/railpack"18)19 20type InstallBinStepBuilder struct {21	DisplayName           string22	Resolver              *resolver.Resolver23	SupportingAptPackages []string24	Package               resolver.PackageRef25}26 27func (c *GenerateContext) NewInstallBinStepBuilder(name string) *InstallBinStepBuilder {28	step := &InstallBinStepBuilder{29		DisplayName: c.GetStepName(name),30		Resolver:    c.Resolver,31		Package:     resolver.PackageRef{},32	}33 34	c.Steps = append(c.Steps, step)35 36	return step37}38 39func (b *InstallBinStepBuilder) Name() string {40	return b.DisplayName41}42 43func (b *InstallBinStepBuilder) Default(name string, defaultVersion string) resolver.PackageRef {44	b.Package = b.Resolver.Default(name, defaultVersion)45	return b.Package46}47 48func (b *InstallBinStepBuilder) GetOutputPaths() []string {49	return []string{b.getBinPath()}50}51 52func (b *InstallBinStepBuilder) Version(name resolver.PackageRef, version string, source string) {53	b.Resolver.Version(name, version, source)54}55 56func (b *InstallBinStepBuilder) GetLayer() plan.Layer {57	return plan.NewStepLayer(b.Name(), plan.Filter{58		Include: b.GetOutputPaths(),59	})60}61 62func (b *InstallBinStepBuilder) Build(p *plan.BuildPlan, options *BuildStepOptions) error {63	packageVersion := options.ResolvedPackages[b.Package.Name].ResolvedVersion64	if packageVersion == nil {65		return fmt.Errorf("package %s not found", b.Package.Name)66	}67 68	step := plan.NewStep(b.DisplayName)69	step.Secrets = []string{}70	// take a look at mise_step_builder for any config that would be useful here71	step.Variables = map[string]string{72		// Enforces HTTPS and stricter security73		"MISE_PARANOID": "1",74	}75	step.Inputs = []plan.Layer{76		plan.NewImageLayer(RailpackBuilderImage),77	}78 79	// TODO copy MISE_VERBOSE from the environment if it's set80 81	binPath := b.getBinPath()82 83	step.AddCommands([]plan.Command{84		plan.NewExecCommand(fmt.Sprintf("mise install-into %s@%s %s", b.Package.Name, *packageVersion, binPath)),85		plan.NewPathCommand(binPath),86		plan.NewPathCommand(fmt.Sprintf("%s/bin", binPath)),87	})88 89	p.Steps = append(p.Steps, *step)90 91	return nil92}93 94func (b *InstallBinStepBuilder) getBinPath() string {95	return fmt.Sprintf("%s/%s", BinDir, b.Package.Name)96}97